William alen gentry



a(No Model.)

W. A. GfENTRYl RAIGHET MINING DRILL.

No. 393,895.- Patented Dec. 4, 1888.

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UNITED STATES PATENT OFFICE.

VILLIAM ALEN GENTRY, OF TRENTON, GEORGIA, ASSIGNOR OF ONE-HALF TO IV. G. MORRISON, OF SAME PLACE.

RATCHET MINING-DRILL.

SPECIFICATION forming' part of Letters Patent N0. 393,895, dated December 4, 1888.

Application filed September 6, 1887. Serial No. 248,991. (No model.)

Io tion and arrangement of parts hereinafter described and claimed.-

Figure l is a side elevation (part of the tube being in section) of the drilling apparatus as arranged when in use with a shortdrill proper. Fig. 2 is a side elevation ofthe apparatus in use with a longer drill proper, the feed-screw being reversed to begin boring anew. Fig. 3 is a cross-section on line y y, Fig. I. Fig. -l is a cross-section on line a', 2o Fig. l. Fig. 5 is a perspective view of the polygonal nut.

The tubular stock or barrel A of the drill has a socket at one end to receive the drill B and a socket, A2, at the other end to receive 2 5 the polygonal nut C, through which the screw D works. The reversible nut C has a central flange, C', and either of its polygonal ends C2 C3 will snugly it the correspondinglyformed socket A'I2 of the barrel.

3o The feed-screw D is threaded from end to end, and has at each end a conical centeringpoint, d, a collar, d', which snugly fits the interior of the barrel A, and a hole to receive the pin (Z3, for holding the feed-screw stationary while the barrel revolves upon it. The collars d', above described, together with the nut C, will vhold and guide the feed-screw steadily within the tubular stock and prevent wabbling. 4.o A ratclIet-wheel, F, is securely keyed to the stock A and collars G having ro'ectin ears g, are fitted to turn freely upon said stock against the sides of the said ratclIet-wheel, and are secured by bolts g g to the opposite sides and end of a hand-lever, I-I. The handlever H carries a spring-pawl, I, upon the end h, located squarely opposite the faces of the ratchet-teeth, and is bent at its middle portion, h', and its end h2, to provide a handle,

wliiclrwill be located squarely opposite the 5o ratchet-wheel F, and thus relieve the drill, the stock,-and the feed-screw of unequal or twisting strains which would tend to lessen. the accuracy of the work.

In Figs. l and 2 the apparatus is shown 55 in operation with drills proper of different lengths and arranged horizontally, the feedscrew D being supported at its outer end on the step or sleeve E, which is adj ustably clamped on an extensible post that is secured 6o vertically, in the usual way, between the roof and floor of the gallery The pin d3 is in contact with the arm of sleeve Il and prevents rotation of the screw. III Fig. l the short drill proper is shown as having entered the breast nearly its length, and consequently the nut C has been worked along the feedscrew D nearly to its outer end, and the screw has also necessarily entered the tube A to a corresponding length. In order to bore still 7o deeper into the breast, it is necessary to vremove the said short drill proper and substitute a longer one, as shown in Fig. 2. At the same time the feed-screw D is removed from the tube A and reversed, so that its outer end and the nut C enter the tube, and its inner end is centered and supported on the adjustable sleeve E, as before, all as shown in said Fig. 2. Thus the apparatus is prepared for boring farther, and such operation may be 8o continued until the longer drill .proper shall have entered the breast toits full length, when the nut C will have worked along the feedscrew nearly to the outer head of the latter, as before. S 5

The reversibility of the screw and nut is therefore very important in practical operation, and has the further advantage of causing the threads of the screw and nut to wear equally on each side. 9o

I claim as my invention and desire to secure by Letters Patentl. The combinatiolrof the reversible nut C, having the central peripheral flange, C', and v similar polygonal ends, C'2 C3, with the feed- 95 screw D, working through said nut, and the tubular drill-stock A, having the socket A2 at one end adapted to receive'either end of the 11111', and the ratchet, pmvl, and lever for rotating' i'hc drill-srcck, :1S Shown and dei l scribed.

Q. The combination of thc pin (13, the sleeve E, having un arm against which said pin bears, with the posi', en which the sleeve is ndjustably Secured, the feed-screw having n hole in each end to receive said pin, the nut C, drill-stock A, and ratchet-lever mechanism, as lQhown and described.

WILLIAM ALEX GENTRY. \\'it'nesses:

J. P. JOCEWAY, J. A. BENNETT. 

